School's out for the summer, and Diary of a Wimpy Kid is back for a sequel. Zachary Gordon is the eponymous kid, Greg; Devon Bostick is his supposedly cool elder brother, Rodrick, and Steve Zahn is their long-suffering dad. Greg's hoping the summer will bring nothing more than an opportunity to mature and improve as a gamer, but fate has other plans. The first movie looked pretty moderate, but the new one is an amiable entertainment that rattles along likably enough. It begins with the design conceit of the black-and-white line drawings morphing into live-action figures, but this is dropped after the introductory sequence; otherwise it's a pretty straight family comedy. Zachary Gordon himself may become the Shia LaBeouf or Joseph Gordon-Levitt of the future, or fade from view after these movies. Either way, it's perfectly workable popcorn entertainment for the school holidays.